Improvement in spindles for screw-machines



"UNITED STATES Barniv'r OFFICE.

DEARBORN P. GLINES, OF MANCHESTER, HAMPSHIRE, ASSIGNOR TO DANIEL Y M.ROBERTSON, OF BOSTON, MASSACHUSETTS.

' IMPROVEMENT msPlNDLEs FOR scREw-MAcH|Ni-:s.

Speciiication forming part of Letters Patent No. 116,301, dated June 27,1871.

To'all 'whom fit may concern:

Be it known that I, DEARBORN P. GLINEs, of Manchester, in the county ofHillsborough and State of New Hampshire, have inventeda new and usefulImproved Spindle for Screw-Machinery; and I do hereby declare thefollowing to be a full and correct description of the same, referencebeinghad to the accompanying drawing, in whichof devices forming part ofthe spindle of a screwmachine, which afford the means of readilyladjusting the griping-jaws which receive and hold the screw-blank whilebeing threaded, and of compensating for their wear, all as hereinaftermore particularly described.

In the accompanying drawing the details of construction of the devicesconstituting the feed motion by which the blanks are delivered to thegriping-jaws are not represented, inasmuch as said feed-motion is not ofmy invention, and a detailed description of it is not necessary to anexplanation of my improvements in spindles.

A in the drawing marks the frame of the machine by which the workingparts are supported. K is a pulley attached to the spindle, whichreceives motion from a band driven by any suitable prime mover. Apulley, H, at the end of the spindle, by means of a cord or band,communicates motion to the pulley B on the end of the cam-shaft O, towhich is attached the cam D. This cam operates the upright lever E,which has its fulcrum at f. The upper end of lever E is in the form oflY, each arm of which has at its end an inwardly-projecting pin, b, whichenters a groove, c, in a cylindrical collar, F, which slideslongitudinally on the spindle and also revolves with it. G marks thewalls of the hollow rear portion of the spindle 5 J, the more solidportion, and L, the hollow in its forward end. In the rear end of theportion G of the spindle is inserted the screw-head M, throughwhichpasses the rod P, on the threaded end of which plays the nut N. The headM is threaded and works in a female screw at the rear end of Gr. Itsouter portion is squared to admit of its being turned by a wrench whenitis desired to adjust its position in the spindle. The rod or bolt P hasa large dat head, R, against which reacts a spiral spring, t',compressed between said head and the screw-head M, as seen in Fig. 2. Tothe head R of the rod P are pivoted, at m, theA arms Sl S', which, withthe arms'T T', pivoted to them at m m', form a compound lever operatingon the principle of the lazy-tongs, to which the sliding rod Uis pivotedat m. The arms S S have prolongations S S, which pass out through slotsg gin cylinder Gr and enter slots c c in the sliding collar F. The endsof the projections S S work over the rounded surfaces of the dogs e c.As the collar F moves forward the arms S S are forced toward each other;as it moves backward they are thrown apart. The rod U passes forwardthrough aperforation in the more solid portion J of the spindle. To itsforward end are pivoted, at s, the toggle-arms V V, and these are againpivoted at t t to the griping-jaws W WV, which have their fulcrums at uu. As the rod U is pushed forward the arms V V are brought more nearlyinto line with each other and the griping-jaws are driven together.

adjusted by the screw-head M and nut N. The iirst or approximateadjustment of the system which operates the jaws W W is made by thescrew-head M. The final adjustment is made by the nut N, which, inconjunction with the spring i, regulates the position of the rod Prelatively to the head M.

The operation is'as follows: The screw-blank to be threaded is presentedto the griping-jaws by the feeding device of the machine. The openingand closing of the griping-jaws are effected at the proper moment by thereciprocating movement of the sliding collar F, which operates theprojecting ends S S of the arms S S. The collar E is operated by leverE, driven by camD on shaft G. It rotates with the spindle on which itslides, the spindle being driven by a band applied to pulley K. Theapproximation of the gripin gjaws IV W is controlled by the throw of thetoggle-arms V V, and this is regulated by the position of head M and rodP, as before stated. The jaws can be adjusted to compensate for wear orto gripe blanks of different sizes withmore or less When the rod U isdrawn back the jaws are separated. The play of the rod U is regulated bythe position of the rod P, which is force. ns required. The thread isout in the usual arms V V, and jaws W W', in the manner and Way, whichforms no partof my invention, for the purpose specified.

Havingthusfnilydesoribedmyinvention,what f5.l In combination with therotating mandrel l elziiin, und desire to secure by Letters Patent, andsystem of toggies, levers, and jaws, as set is forth, the dogs e undsliding-collar F, in the mau 1. The combination of the head M, rod P,nut ner described.

N, :1nd spring,y z'. with the toggle-levers S and T, The abovespecification of my said invention :ind lneehmiisin oreonneetingthe samewith the signed and witnessed at Manchester this 28th gripingizuvs, inthe manner and for the purpose I day of March, A. D. 1871.

described; /Vitnesses: DEARBORN P. GLINES.

2. The combination, with the adjustable and C. N. STANLEY,

yiOnnOg rOd P, Of the arms s' s' 'r fr', ma U l GEORGE W. MORRISON.

